[Latingp] Latin Variants working docs

I have updated the work plan for variant group: https://docs.google.com/document/d/1UM1WdyMC5HIM3jyu3V75yVFQ0ZndguGV3pAMkeDh... and created this summary document with available body of knowledge to facilitate our work https://docs.google.com/document/d/1w76ObHKBuhlMh4ajX07M1x9eNSUiCuhHTq9sNzaB... -Dennis